Wall Street S&P 500 hits fresh peak after Fed

Wall Street stocks jumped today, taking the S&P 500 index of top companies to an all-time record after the Federal Reserve promised to keep in place low interest-rate policies and forecast the world's biggest economy would expand moderately.

Treasuries prices also gained, as the dollar added to mild losses posted ahead of a Fed policy statement and a news conference by US central bank chief Janet Yellen, who calmed investor worries she might adopt a more hawkish tone on monetary policy.

The S&P 500 gained 14.99 points or 0.77 percent, to finish at 1,956.98, eclipsing the previous record set on June 9.

The Dow Jones industrial average rose 98.13 points, or 0.58 percent, to end at 16,906.62. The Nasdaq Composite added 25.60 points or 0.59 percent, to 4,362.84 as US equities extended a three-day winning streak